CVE-2026-59991: Psd-Tools

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

psd-tools is a Python package for working with Adobe Photoshop PSD files. Prior to 1.17.4, PSDImage.composite() and PSDImage.numpy() allocated output buffers from attacker-controlled PSD header geometry, including width, height, channels, depth, and per-layer rectangles, before validating those values against the available file data. A tiny crafted PSD could therefore cause multi-gigabyte memory allocation, and PSDImage.composite() could return a black image with only a warning instead of raising an exception. Services that composite untrusted PSD files could be terminated by out-of-memory handling. This issue is fixed in version 1.17.4.

Affected products

• Psd-Tools Psd-Tools: before 1.17.4 (fixed in 1.17.4)

Published 2026-09-22. Last modified 2026-09-23.